(139233) Henych Main-belt Asteroid
Discovered on 25 April 2001 by Kusnirak, P., Pravec, P. at Ondrejov.
Tomáš Henych (b. 1984) is a Czech astronomer who obtained his Ph.D. degree in 2013 and joined the Meteor Physics Group at Ondřejov Observatory in 2020. He studied asteroid collisions and is currently working on meteoroid fragmentation in the Earth's atmosphere.Naming citation (WGSBN Bull. 3, #9, 39), IAU / Minor Planet Center, via NASA/JPL
Where Henych is today
Seen from above the solar system on 2026-10-14: Henych is 2.41 au from the Sun and 3.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 139233 |
| Provisional designation | 2001 HT18 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.25 km (#14,605 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0550 |
| Absolute magnitude (H) | 16.38 |
| Orbital period | 4.28 years |
| Semi-major axis | 2.64 au |
| Perihelion – aphelion | 2.20 – 3.07 au |
| Eccentricity | 0.166 |
| Inclination | 10.8° |
| Closest distance between its orbit and Earth's (MOID) | 1.21 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.